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National audit of a system for rectal contact brachytherapy.pdf

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National audit of a system for rectal contact brachytherapy.pdf

Physics and Imaging in Radiation Oncology 1 (2017) 1–5 Contents lists available at ScienceDirect Physics and Imaging in Radiation Oncology journal homepage: /locate/phro Original Research Article National audit of a system for rectal contact brachytherapy Laia Humbert-Vidan a,?, Thorsten Sander b, David J. Eaton c, Catharine H. Clark b,c,d a Department of Medical Physics, St Thomas’ Hospital, London, UK b Radiation Dosimetry Group, National Physical Laboratory, Teddington, Middlesex, UK c National Radiotherapy Trials QA (RTTQA) Group, Mount Vernon Hospital, Northwood, Middlesex, UK d Department of Medical Physics, Royal Surrey County Hospital, Guildford, Surrey, UK article info Article history: Received 12 July 2016 Received in revised form 4 December 2016 Accepted 4 December 2016 Keywords: Contact brachytherapy Electronic brachytherapy Audit abstract Background and purpose: Contact brachytherapy is used for the treatment of early rectal cancer. An overview of the current status of quality assurance of the rectal contact brachytherapy systems in the UK, based on a national audit, was undertaken in order to assist users in optimising their own practices. Material and methods: Four UK centres using the Papillon 50 contact brachytherapy system were audited. Measurements included beam quality, output and radiation ?eld size and uniformity. Test frequencies and tolerances were reviewed and compared to both existing recommendations and published reviews on other kV and electronic brachytherapy systems. External validation of dosimetric measurements was provided by the National Physical Laboratory. Results: The maximum host/audit discrepancy in beam quality determination was 6.5%; this resulted in absorbed dose variations of 0.2%. The host/audit agreement in absorbed dose determination was within 2.2%. The median of the radiation ?eld uniformity measurements was 2.7% and the host/audit agreement in ?eld size was within 1 mm. Test tolerances and frequencies were within the